Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27b7b56ba9c1459…

MALICIOUS

PDF

64.5 KB Created: 2020-10-02 17:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: b3c5250841c3ad03c17d88d56d9b4433 SHA-1: 999feb91c28c4d523482c01ca9ee03426038c753 SHA-256: a27b7b56ba9c1459f450da8f3bc9ff8a9c08fdcce6d3296200428393be0535d0
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=big+ideas+learning+geometry+1.+6+answers In PDF document text
    • http://files.hartskihill.com/uploads/1/3/0/8/130874533/jofoneribojuzij.pdfIn PDF document text
    • http://mogaxi.sydneynewhorizons.org/uploads/1/3/1/6/131637131/3005db73d4c89bc.pdfIn PDF document text
    • http://gewadovav.thepmdgroup.net/uploads/1/3/1/3/131380344/vubikazo.pdfIn PDF document text
    • http://kapabeko.elephantsinthecoffee.com/uploads/1/3/0/7/130776445/tafuledutax.pdfIn PDF document text
    • https://site-1036733.mozfiles.com/files/1036733/lixotajarep.pdfIn PDF document text
    • https://site-1036956.mozfiles.com/files/1036956/jubomiwubativepagatiwa.pdfIn PDF document text
    • https://site-1036785.mozfiles.com/files/1036785/34486148263.pdfIn PDF document text
    • https://site-1036925.mozfiles.com/files/1036925/zoson.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/45cc350d-dc57-42e7-95a7-13c6845a49a8/91511560718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5944/5401/files/consumer_behaviour_book_for_mba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/7053/0212/files/pekedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/74546558423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5663/3758/files/witches_almanac_2020.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF3 5628 bytes
SHA-256: aaa641f081820e774ec8eaab412bbb6883f078de97d7c7d77fb12efc9c7a91a8
font_01_sfnt_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 9952 bytes
SHA-256: 6aa2e213b2a6d261300ae6642d9f95a5767162558ecae044354d1ea2052f830f